((lambda ()
  (var dbus         (.session-bus (require "dbus-native")))
  (var dbus-name    "org.jackaudio.service")
  (var dbus-path    "/org/jackaudio/Controller")
  (var dbus-service (dbus.get-service dbus-name))
  (return (lambda (iface cb)
    (dbus-service.get-interface dbus-path iface cb)))))
